Selection of Entomopathogenic Fungi for Aphid Control

• Published in: Journal of bioscience and bioengineering Vol. 104; no. 6; pp. 498 - 505
• Main Authors: Vu, Van Hanh, Hong, Suk Il, Kim, Keun
• Format: Journal Article
• Language: English
• Published: Amsterdarm Elsevier B.V 01.12.2007; Elsevier Science; Elsevier Limited
• Subjects: aerial conidia; Animals; Aphididae; Aphids - microbiology; Aphids - physiology; Aphis gossypii; Beauveria bassiana; Biological and medical sciences; Biotechnology; entomopathogenic fungi; Fundamental and applied biological sciences. Psychology; Fungi - classification; Fungi - growth & development; Fungi - isolation & purification; Fungi - pathogenicity; germination; Metarhizium anisopliae; Myzus persicae; Nomuraea rileyi; Paecilomyces farinosus; Pest Control, Biological - methods; Survival Analysis; Survival Rate; vegetative growth; germination; Aphis gossypii; entomopathogenic fungi; aerial conidia; Myzus persicae; vegetative growth; Entomopathogen; Aphidoidea; Growth; Insecta; Germination; Selection; Fungi; Homoptera; Arthropoda; Aphididae; Invertebrata; Conidia
• ISSN: 1389-1723; 1347-4421
• DOI: 10.1263/jbb.104.498

Twelve strains of entomopathogenic fungi such as Lecanicillium lecanii, Paecilomyces farinosus, Beauveria bassiana, Metarhizium anisopliae, Cordyceps scarabaeicola, and Nomuraea rileyi were screened for aphid control. At 25°C and 75% relative humidity (RH), among tested entomopathogenic fungi, L. lecanii 41185 showed the highest virulent pathogenicity for both Myzus persicae and Aphis gossypii, and their control values were both nearly 100% 5 and 2 d after treatment, respectively. Moreover, at an RH of 45% and in a wide temperature range (20–30°C), L. lecanii 41185 also exhibited the highest virulence to M. persicae. The control value of M. persicae and the 50% lethal time (LT 50) decreased significantly as the applied conidial concentration increased. The 50% lethal concentration (LC 50) of the conidial suspension of this fungus was determined to be 6.55×10 5 conidia/ml. The control values of M. persicae resulting from the application of 1×10 7 and 1×10 8 conidia/ml were nearly the same and were significantly higher than that of 1×10 6 conidia/ml. The tested entomopathogenic fungi grew in a broad temperature range (15–30°C). Lecanicillium strains showed optimum growth at 25°C. The aerial conidia of Lecanicillium strains also could germinate in a broad temperature range (15–30°C) and L. lecanii 41185 was the only strain with conidial germination at 35°C.